
UNIDENTIFIED

80386SX MOTHERBOARD

Processor         80386SX
Processor Speed   16MHz
Chip Set          NEAT
Max. Onboard DRAM 8MB
Cache             None
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       80387SX

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         J1       Reset switch                J4

  Speaker                     J2       Turbo LED                   J5

  Turbo switch                J3       External battery            J6

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

     Turbo enabled                             J3           pins 1 & 2
                                                              closed

      Turbo disabled                            J3           pins 2 & 3
                                                              closed

     Battery type select internal              J6           pins 1 & 2
                                                              closed

      Battery type select external              J6            Closed

      CMOS memory clear                         J6           pins 3 & 4
                                                              closed

     Pipeline enabled                         JP3            Closed

      Pipeline disabled                        JP3             Open

     NPU asynchronous with CPU                JP4            Closed

      NPU synchronous with CPU                 JP4             Open

      NPU enabled                              JP5            Closed

      NPU disabled                             JP5             Open

     Clock select 80386SX clock 2             JP6           pins 2 & 3
                                                              closed

      Clock select 80387SX clock 2             JP6           pins 1 & 2
                                                              closed

     BIOS type select 27256                   JP7           pins 1 & 2
                                                              closed

      BIOS type select 27128                   JP7           pins 2 & 3
                                                              closed

     Monitor type select monochrome           JP8           pins 2 & 3
                                                              closed

      Monitor type select color/EGA/VGA        JP8           pins 1 & 2
                                                              closed

     BIOS pin select 23 pin                   JP9           pins 1 & 2
                                                              closed

      BIOS pin select 30 pin                   JP9           pins 2 & 3
                                                              closed

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

    512KB        (2) 256K x       NONE           NONE           NONE
                     9

    512KB          NONE           NONE        (18) 41256        NONE

     1MB         (2) 256K x    (2) 256K x        NONE           NONE
                     9             9

     1MB           NONE           NONE        (18) 41256     (18) 41256

    1.5MB        (2) 256K x    (2) 256K x     (18) 41256        NONE
                     9             9

    1.5MB        (2) 256K x       NONE        (18) 41256     (18) 41256
                     9

     2MB         (2) 256K x    (2) 256K x     (18) 41256     (18) 41256
                     9             9

     2MB        (2) 1M x 9        NONE           NONE           NONE

     2MB           NONE           NONE       (18) 411000     (18) 411000

     4MB        (2) 1M x 9     (2) 1M x 9        NONE           NONE

     4MB        (2) 1M x 9        NONE       (18) 411000     (18) 411000

     5MB        (2) 1M x 9     (2) 1M x 9     (18) 41256     (18) 41256

     5MB        (2) 1M x 9     (2) 1M x 9    (18) 411000        NONE

     5MB        (2) 1M x 9     (2) 1M x 9     (18) 41256     (18) 41256

     6MB        (2) 1M x 9     (2) 1M x 9    (18) 411000     (18) 411000

     6MB        (2) 1M x 9     (2) 1M x 9    (18) 411000     (18) 411000

     8MB        (2) 4M x 9     (2) 4M x 9        NONE           NONE

                         DRAM JUMPER CONFIGURATION

    Size                   JP1                           JP2

    512KB      1 & 2, 3 & 4, 5 & 6, 7 & 8,    1 & 2, 3 & 4, 5 & 6, 7 & 8,
                     9 & 10, 11 & 12               9 & 10, 11 & 12

    512KB      1 & 12, 2 & 11, 3 & 10, 4 &    1 & 12, 2 & 11, 3 & 10, 4 &
                     9, 5 & 8, 6 & 7               9, 5 & 8, 6 & 7

     1MB       1 & 2, 3 & 4, 5 & 6, 7 & 8,    1 & 2, 3 & 4, 5 & 6, 7 & 8,
                     9 & 10, 11 & 12               9 & 10, 11 & 12

     1MB       1 & 12, 2 & 11, 3 & 10, 4 &    1 & 12, 2 & 11, 3 & 10, 4 &
                     9, 5 & 8, 6 & 7               9, 5 & 8, 6 & 7

    1.5MB      1 & 2, 3 & 4, 5 & 6, 7 & 8,    1 & 2, 3 & 4, 5 & 6, 7 & 8,
                     9 & 10, 11 & 12               9 & 10, 11 & 12

    1.5MB      1 & 12, 2 & 11, 3 & 10, 4 &    1 & 12, 2 & 11, 3 & 10, 4 &
                     9, 5 & 8, 6 & 7               9, 5 & 8, 6 & 7

     2MB       1 & 2, 3 & 4, 5 & 6, 7 & 8,    1 & 2, 3 & 4, 5 & 6, 7 & 8,
                     9 & 10, 11 & 12               9 & 10, 11 & 12

     2MB       1 & 2, 3 & 4, 5 & 6, 7 & 8,    1 & 2, 3 & 4, 5 & 6, 7 & 8,
                     9 & 10, 11 & 12               9 & 10, 11 & 12

     2MB       1 & 12, 2 & 11, 3 & 10, 4 &    1 & 12, 2 & 11, 3 & 10, 4 &
                     9, 5 & 8, 6 & 7               9, 5 & 8, 6 & 7

     4MB       1 & 2, 3 & 4, 5 & 6, 7 & 8,    1 & 2, 3 & 4, 5 & 6, 7 & 8,
                     9 & 10, 11 & 12               9 & 10, 11 & 12

     4MB       1 & 12, 2 & 11, 3 & 10, 4 &    1 & 12, 2 & 11, 3 & 10, 4 &
                     9, 5 & 8, 6 & 7               9, 5 & 8, 6 & 7

     5MB       1 & 2, 3 & 4, 5 & 6, 7 & 8,    1 & 2, 3 & 4, 5 & 6, 7 & 8,
                     9 & 10, 11 & 12               9 & 10, 11 & 12

     5MB       1 & 2, 3 & 4, 5 & 6, 7 & 8,    1 & 2, 3 & 4, 5 & 6, 7 & 8,
                     9 & 10, 11 & 12               9 & 10, 11 & 12

     5MB       1 & 12, 2 & 11, 3 & 10, 4 &    1 & 12, 2 & 11, 3 & 10, 4 &
                     9, 5 & 8, 6 & 7               9, 5 & 8, 6 & 7

     6MB       1 & 2, 3 & 4, 5 & 6, 7 & 8,    1 & 2, 3 & 4, 5 & 6, 7 & 8,
                     9 & 10, 11 & 12               9 & 10, 11 & 12

     6MB       1 & 12, 2 & 11, 3 & 10, 4 &    1 & 12, 2 & 11, 3 & 10, 4 &
                     9, 5 & 8, 6 & 7               9, 5 & 8, 6 & 7

     8MB       1 & 2, 3 & 4, 5 & 6, 7 & 8,    1 & 2, 3 & 4, 5 & 6, 7 & 8,
                     9 & 10, 11 & 12               9 & 10, 11 & 12

  Note: Pins designated should be in the closed position.

